Explosion-proof hydraulic system and lateral tipping carriage applying same

Abstract

The invention relates to the technical field of anti-explosion hydraulic pressure, and discloses an anti-explosion hydraulic system and a lateral tipping carriage applying the system.The anti-explosion hydraulic system comprises a cylinder barrel and further comprises a rod set connected to the interior of the cylinder barrel in a sliding mode and an inner rod connected to the interior of the rod set in a sliding mode, and a spring rod is connected between a sliding rod and a third-level rod; the sliding rod comprises an initial position and a set position, when the sliding rod is at the initial position, the third-level rod does not communicate with the inner rod, meanwhile, the inner rod is fixed through the pressing piece, and when the sliding rod is at the set position, the third-level rod communicates with the inner rod. The sliding rod is matched with the inner groove in the inner wall, so that the sliding rod, the sleeve shell, the pressing piece and other components work cooperatively, a stable control structure is formed, when the sliding rod is located at the initial position, the third-level rod does not communicate with the inner rod, meanwhile, the pressing piece fixes the inner rod, when the sliding rod moves to the set position, the third-level rod communicates with the inner rod, and precise telescopic action is achieved; hydraulic oil pushes all levels of rod bodies to stretch according to a preset sequence, and disordered stretching sequence is effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of explosion-proof hydraulics, and in particular to an explosion-proof hydraulic system and a sideways tipping carriage using the system. Background Art

[0002] The multi-stage hydraulic system, also known as a telescopic hydraulic cylinder, is composed of a plurality of cylinder barrels of different diameters, shaped like a sleeve structure, and contains a plurality of independently retractable piston assemblies inside. Each piston assembly corresponds to a cylinder barrel. When working, the hydraulic oil enters the cylinder and pushes the piston to extend or retract step by step to achieve multi-stage telescopic action. The multi-stage cylinder is widely used in mechanical equipment such as dump trucks, cranes, and aerial work platforms.

[0003] However, in the prior art, an abnormal situation often occurs in which the oil pushes the next piston in advance before the first piston is fully extended, resulting in a disordered order of extension and retraction of the various stages of the cylinder, and the inability to complete the work process according to the predetermined logic. Usually, when the oil cylinder is well sealed, it is mainly because during the operation of the multi-stage oil cylinder, if the load suddenly changes, for example, the load borne by the first-stage oil cylinder suddenly decreases, while the loads of other-stage oil cylinders are relatively large, then when the oil is injected, the first-stage oil cylinder may move rapidly due to the load reduction, causing the pressure in its rodless chamber to drop rapidly. At this time, if the pressure compensation device in the system cannot be adjusted in time, the oil flow direction and pressure distribution cannot be accurately controlled, causing the oil to be diverted due to pressure when the first-stage push rod is fully extended. At this time, the oil produces cross-flow and preferentially flows to the next-stage oil cylinder with relatively higher pressure, resulting in disorder. Secondly, it may be because there is a problem in the oil inlet pipeline of the first-stage oil cylinder. If the oil flow is blocked by foreign objects or the pipeline is not smooth due to bending, flattening, etc., the oil inlet speed of the first-stage cylinder will be slowed down and the oil inlet time will be excessively extended. In this case, the system pressure may gradually increase. When the pressure increases to a level sufficient to overcome the oil inlet resistance of the next-stage cylinder, the oil will directly enter the next-stage cylinder. At this time, the first-stage cylinder may not be full of oil, which will cause the cross-flow to be disordered. At present, filters are used for filtering and maintenance of the filters is required. However, this requires regular maintenance by operators. Once neglected, it is easy to cause disorder of the cylinders and bursting due to insufficient load-bearing capacity. The non-sequential extension and retraction of the push rods will cause abnormal stress on components such as the robotic arm and lifting platform, accelerate fatigue damage of key components, greatly increase maintenance costs and downtime, and significantly reduce work efficiency. In the case of loading and unloading and lifting, it will cause safety accidents such as equipment imbalance and heavy objects falling, causing serious harm to operators. Summary of the invention

[0004] The purpose of the present invention is to provide an explosion-proof hydraulic system and a sideways tipping carriage using the system, so as to solve the problem of fluid disorder in the explosion-proof hydraulic device.

[0005] On the one hand, the present invention provides an explosion-proof hydraulic system, which includes a cylinder barrel, a rod group slidably connected inside the cylinder barrel, and an inner rod slidably connected inside the rod group.

[0006] The rod group includes a first-stage rod slidably connected inside the cylinder barrel, a second-stage rod slidably connected inside the first-stage rod, and a third-stage rod slidably connected inside the second-stage rod. The internal structures of the first-stage rod, the second-stage rod, and the third-stage rod are the same, but their diameters gradually decrease. Inner grooves are provided on the inner walls of the cylinder barrel, the first-stage rod, and the second-stage rod.

[0007] A sliding rod is slidably connected inside the third-stage rod. A sleeve is provided inside the third-stage rod. A pressing member is slidably connected inside the sleeve. A spring rod is connected between the sliding rod and the third-stage rod. The sliding rod includes an initial position and a set position. When the sliding rod is in the initial position, the third-stage rod is not in communication with the inner rod, and at the same time, the inner rod is fixed by the pressing member. When the sliding rod is in the set position, the third-stage rod is in communication with the inner rod.

[0008] Furthermore, a liquid flow hole is provided at the center of the third-stage rod. A semi-circular groove is provided at the bottom end of the third-stage rod. Installation grooves are provided at the bottom ends of the third-stage rod and the inner rod. A chute opening is provided inside the third-stage rod. The sliding rod is located inside the chute opening. A locking sleeve is fixedly connected inside the installation groove. An installation groove is provided at the bottom of the inner rod.

[0009] Furthermore, through holes and semi-circular grooves are provided on the sliding rod. The through holes are the same size as the liquid flow holes. The end of the sliding rod away from the spring rod is arc-shaped. When the sliding rod is in the set position, this end fits with the inner groove, and the liquid flow hole is concentric with the through hole. The two sides of the semi-circular groove are arc-shaped.

[0010] Furthermore, the pressing member includes a pressing rod slidably connected inside the sleeve, and a plurality of steel balls placed on the top of the pressing rod. A limiting ring is provided at the top of the sleeve. The limiting ring is located above the steel balls and is in contact with them.

[0011] Furthermore, a return spring is connected between the sleeve and the pressing rod. When the sliding rod is in the initial position, the sleeve is located inside the locking sleeve.

[0012] Furthermore, when the sliding rod is in the initial position, the distance from the center of the liquid flow hole to the center of the through hole is equal to the distance from one end of the sliding rod to the inner end point of the inner groove, and is also equal to the distance between the center line of the semi-circular groove and the center line of the pressing rod.

[0013] Furthermore, the bottom of the inner groove is set as a downward-sloping slope, and the top of the inner groove is a horizontal plane.

[0014] Further, a plurality of reinforcing holes are equidistantly formed in the casing and the locking sleeve, and the number of the reinforcing holes is the same as that of the steel balls. When the sliding rod is in the initial position, half of the steel balls are located inside the corresponding reinforcing holes.

[0015] Further, both sides of the bottom end of the pressing rod are arc-shaped, and the top end of the pressing rod is spherical.

[0016] On the other hand, the present invention provides: a side-tipping carriage, including an explosion-proof hydraulic system, a vehicle frame, and a carriage body rotatably connected to the top of the vehicle frame. The vehicle frame is rotatably connected to the top of the inner rod, and the carriage body is rotatably connected to the cylinder barrel.

[0017] Advantages of the present invention: Through the cooperation of the sliding rod and the inner groove of the inner wall, components such as the sliding rod, the casing, and the pressing member work together to form a stable control structure. When the sliding rod is in the initial position, the third-level rod is not communicated with the inner rod, and at the same time, the pressing member fixes the inner rod, effectively preventing the hydraulic oil from entering the inner rod in advance and causing telescopic disorder. When the sliding rod moves to the set position, the third-level rod is communicated with the inner rod, realizing precise telescopic movement. The hydraulic oil pushes the rod bodies of each level to telescopic in a predetermined order, effectively avoiding telescopic sequence disorder and having a strong explosion-proof effect.

[0018] By pushing the sliding rod with hydraulic oil, uniform transmission of force is achieved, and at the same time, the pressing member is controlled to control the movement of the inner rod, enhancing the structural strength and reliability of the system, reducing maintenance requirements, and eliminating the need for complex maintenance of the electronic system. It ensures that the rod bodies of each level extend and retract strictly in accordance with the predetermined logic, effectively avoiding disorder caused by sudden load changes or pipeline abnormalities.

[0019] By uniformly setting the internal structures of the rod bodies of each level, only the sizes of the corresponding components are different, which makes the components highly universal. The sizes of the casing and the pressing member do not need to be adjusted, and they can be produced uniformly, reducing the cost increase caused by customized production. In addition, when a component inside a certain rod body is damaged, the component with the same structure can be quickly replaced without waiting for the production of customized components, improving the equipment maintenance efficiency and reducing the downtime. Brief Description of the Drawings

[0020] Figure 1 It is a state diagram when the carriage body of the present invention is tilted; Figure 2 It is a structural schematic diagram of the side-tipping carriage of the present invention; Figure 3 It is a structural schematic diagram of the cylinder barrel of the explosion-proof hydraulic system of the present invention; Figure 4 It is a top view of the cylinder barrel of the explosion-proof hydraulic system of the present invention; Figure 5 It is the explosion-proof hydraulic system of the present invention Figure 4 The cross-sectional view taken along line A-A; Figure 6 This is a partial cross-sectional view of the three-stage rod of the explosion-proof hydraulic system of the present invention; Figure 7 This is a schematic structural view of the sliding rod of the explosion-proof hydraulic system of the present invention; Figure 8 This is a cross-sectional view of the casing of the explosion-proof hydraulic system of the present invention; Figure 9 This is the explosion-proof hydraulic system of the present invention Figure 5 An enlarged schematic view at position B in; Figure 10 This is the state diagram of the sliding rod of the explosion-proof hydraulic system of the present invention when it is in the set position.

[0021] In the figure: 1. Frame; 2. Compartment body; 3. Cylinder barrel; 4. Rod group; 41. First-stage rod; 42. Second-stage rod; 43. Third-stage rod; 5. Inner rod; 6. Inner groove; 61. Inner end point; 7. Sliding rod; 71. Through hole; 72. Semicircular groove; 8. Casing; 81. Limiting ring; 82. Return spring; 9. Pressing part; 91. Pressing rod; 92. Steel ball; 10. Spring rod; 11. Locking sleeve; 12. Reinforcing hole; 101. Liquid flow hole; 102. Half-arc groove; 103. Installation groove; 104. Chute opening. Specific embodiments

[0022] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the specific embodiments of the present invention in detail with reference to the accompanying drawings of the specification.

[0023] Example 1, referring to Figures 1 - 10 , which is the first embodiment of the present invention, provides an explosion-proof hydraulic system, including a cylinder barrel 3, further including a rod group 4 slidably connected inside the cylinder barrel 3, and an inner rod 5 slidably connected inside the rod group 4. The rod group 4 includes a first-stage rod 41 slidably connected inside the cylinder barrel 3, a second-stage rod 42 slidably connected inside the first-stage rod 41, and a third-stage rod 43 slidably connected inside the second-stage rod 42, forming a nested structure layer by layer. The internal structures of the first-stage rod 41, the second-stage rod 42, and the third-stage rod 43 are the same, but the diameters gradually decrease. Inner grooves 6 are provided on the inner walls of the cylinder barrel 3, the first-stage rod 41, and the second-stage rod 42. A sliding rod 7 is slidably connected inside the third-stage rod 43. A casing 8 is provided inside the third-stage rod 43. A pressing part 9 is slidably connected inside the casing 8. A spring rod 10 is connected between the sliding rod 7 and the third-stage rod 43. The sliding rod 7 includes an initial position and a set position. When the sliding rod 7 is in the initial position, the third-stage rod 43 is not in communication with the inner rod 5, and at the same time, the inner rod 5 is fixed by the pressing part 9. When the sliding rod 7 is in the set position, the third-stage rod 43 is in communication with the inner rod 5.

[0024] It can be understood that the cylinder 3 is provided with two pipelines for respectively taking on the functions of oil inlet and oil return. Through this oil inlet and oil return cycle, the hydraulic system can continuously provide power for the multi-stage hydraulic cylinder to ensure the continuity of its telescopic action, and the rod group 4 and the inner rod 5 circuit inside it correspond to it.

[0025] It is worth noting that the first-stage rod 41, the second-stage rod 42 and the third-stage rod 43 have the same internal structure, and are all provided with a sliding rod 7, a sleeve shell 8, a pressure piece 9 and a spring rod 10. However, as the diameters of the first-stage rod 41, the second-stage rod 42 and the third-stage rod 43 gradually decrease, the sizes of these corresponding installed components are also precisely adjusted accordingly. Among them, the sizes of the sleeve shell 8 and the pressure piece 9 are not adjusted, and the third-stage rod 43 is not provided with an inner groove 6.

[0026] Specifically, the slide bar 7 includes two states: an initial position and a set position. When the slide bar 7 is in the initial position, the three-stage rod 43 is not communicated with the inner rod 5. At this time, the pressing piece 9 inside the housing 8 firmly fixes the inner rod 5 to prevent the oil from entering the inner rod 5 in advance and causing a disorder in the telescopic sequence. When the slide bar 7 moves to the set position under the action of the hydraulic oil pressure, the three-stage rod 43 and the inner rod 5 are gradually communicated, and the oil will pass into the next rod body, thereby realizing orderly telescopic extension and contraction of each stage of the rod body, and effectively avoiding the problems of oil cross-talk and telescopic sequence disorder. Therefore, if the secondary rod 42 is telescoping at this time, the slide bar 7 inside the secondary rod 42 also includes two states: an initial position and a set position, corresponding to which, thereby ensuring that the equipment is telescoped strictly in sequence.

[0027] Reference Figures 3 - 6 A liquid flow hole 101 is provided at the center of the three-stage rod 43, a semi-arc groove 102 is provided at the bottom end of the three-stage rod 43, a mounting groove 103 is provided at the bottom ends of the three-stage rod 43 and the inner rod 5, a slide groove opening 104 is provided inside the three-stage rod 43, the slide rod 7 is located inside the slide groove opening 104, a locking sleeve 11 is fixedly connected inside the mounting groove 103, and the pressing piece 9 fixes the corresponding components by fixing the locking sleeve 11. A mounting groove 103 is provided at the bottom of the inner rod 5, and a locking sleeve 11 is also provided inside the inner rod 5, so that the pressing piece 9 can also fix the inner rod 5.

[0028] Specifically, the sliding groove opening 104 inside the three-stage rod 43 provides guidance for the movement of the sliding rod 7. The width dimensions of the two are the same, ensuring that the sliding rod 7 can slide flexibly therein without shaking, thereby achieving control of the pressure piece 9. At the same time, the spring rod 10 is located in the semi-arc groove 102. When the sliding rod 7 is in the initial position, one side of the bottom surface of the sliding rod 7 is located in the semi-arc groove 102, and the oil will enter the semi-arc groove 102. Then, when the sliding rod 7 can move, the oil will squeeze the sliding rod 7 and stretch the spring rod 10 at the same time.

[0029] Reference Figures 3 - 7, a through hole 71 and a semi-circular groove 72 are formed on the sliding rod 7. The through hole 71 has the same size as the liquid flow hole 101. One end of the sliding rod 7 away from the spring rod 10 is arc-shaped. When the sliding rod 7 is in the set position, this end fits with the inner groove 6, and the liquid flow hole 101 is concentric with the through hole 71. The two sides of the semi-circular groove 72 are arc-shaped.

[0030] Specifically, when the third-level rod 43 moves upward, the sliding rod 7 gradually approaches the inner groove 6, and the two finally are on the same horizontal line. At this time, the sliding rod 7 has a moving space and moves under the action of the hydraulic oil pressure. One end of the sliding rod 7 away from the spring rod 10 will gradually embed into the inner groove 6. At this time, the through hole 71 also continuously approaches the liquid flow hole 101 synchronously, and the two gradually coincide. The oil liquid will continuously enter the bottom end of the inner rod 5, thus avoiding two different passages from quickly coinciding, which may cause too large an impact. And the height of the liquid flow hole 101 is less than that of the through hole 71, further reducing the impact. And at this time, the inner rod 5 is still fixed by the pressing member 9. When one end of the sliding rod 7 fits with the inner end point 61 of the inner groove 6, the pressing member 9 will synchronously release the locking of the inner rod 5. Then the oil liquid will smoothly flow into the lower part of the inner rod 5 at this time, pushing the next-level piston rod.

[0031] In addition, one end of the sliding rod 7 away from the spring rod 10 is arc-shaped, that is, this end is the arc end of the sliding rod 7. When the sliding rod 7 is in the set position, this end fits with the inner groove 6, and except for the bottom, this end is completely in contact with the inside of the inner groove 6, ensuring sufficient stability.

[0032] Refer to Figures 3 - 8 , the pressing member 9 includes a pressing rod 91 slidably connected inside the housing 8, and a plurality of steel balls 92 placed on the top of the pressing rod 91. A limiting ring 81 is provided at the top of the housing 8. The limiting ring 81 is located above the steel balls 92 and the two are in contact.

[0033] Specifically, the pressing rod 91, the limiting ring 81 and the housing 8 are all made of high-strength corrosion-resistant materials. The bottom of the limiting ring 81 limits the steel balls 92, and the pressing rod 91 can limit the bottom of the steel balls 92, so that the steel balls 92 are located between the limiting ring 81 and the pressing rod 91, preventing the steel balls 92 from shifting or falling off during the movement of the pressing rod 91.

[0034] Refer to Figures 3 - 8 , a return spring 82 is connected between the housing 8 and the pressing rod 91. When the sliding rod 7 is in the initial position, the housing 8 is located inside the locking sleeve 11, and at this time the return spring 82 is in a stretched state.

[0035] Refer to Figures 3 - 8When the slide bar 7 is at the initial position, the distance from the center of the flow hole 101 to the center of the through hole 71 is equal to the distance from one end of the slide bar 7 to the inner end point 61 of the inner groove 6, and is also equal to the distance between the center line of the semicircular groove 72 and the center line of the pressure rod 91. Both refer to horizontal distances. For example, although the inner groove 6 is located above the slide bar 7 at this time, this spacing distance is based on the horizontal angle to represent the horizontal spacing between the two.

[0036] Among them, when the slide bar 7 is not in the set position, that is, when one end of the slide bar 7 is not in contact with the inner end point 61 of the inner groove 6, the slide bar 7 will always squeeze the pressure rod 91, so that the return spring 82 is in a stretched state. In addition, due to the arc-shaped end of the slide bar 7, and this end is completely in contact with the inside of the inner groove 6 except for the bottom, therefore, except for the bottom end of the inner groove 6, the two have the same shape. Since this end of the slide bar 7 is arc-shaped, it can be understood that this end is the end point closest to the inner groove 6, and the corresponding inner groove 6 is also arc-shaped. Then, the inner end point 61 of the inner groove 6 refers to the position where the inner wall of the inner groove 6 is farthest from the slide bar 7 when the slide bar 7 is in the initial position, which is called the inner end point 61. In addition, since the sizes of the slide bars 7 inside the first rod 41, the second rod 42 and the third rod 43 are different, the corresponding sizes of the inner groove 6 also correspond to them one by one.

[0037] Specifically, the distance from the center of the flow hole 101 to the center of the through hole 71 is equal to the distance from one end of the slide bar 7 to the inner end point 61 of the inner groove 6, ensuring that when the slide bar 7 moves from the initial position to the set position, when one end of the slide bar 7 touches the inner end point 61 of the inner groove 6, the flow hole 101 and the through hole 71 can be precisely concentrically aligned, so that the hydraulic oil can flow smoothly from the third-stage rod 43 through the flow hole 101 and the through hole 71 to the bottom end of the inner rod 5. At the same time, the pressure rod 91 will synchronously enter the interior of the semicircular groove 72, thereby releasing the lock on the inner rod 5, ensuring the accuracy and stability of oil transmission during the multi-stage telescopic process of the system, thereby achieving precise control of the telescopic action of each stage of the rod body. Reference Figures 3 - 8 The bottom of the inner groove 6 is set as a downwardly inclined slope, the top of the inner groove 6 is a horizontal plane, and the top of the slide rod 7 can fit with the horizontal plane.

[0038] Specifically, one end of the slide rod 7 close to the inner groove 6 is set as an arc surface to ensure that when the slide rod 7 moves back with the third-level rod 43, the arc surface of the slide rod 7 will be squeezed and contracted by the slope of the inner groove 6. At the same time, when the slide rod 7 reaches the slope position of the inner groove 6, there will be space for movement, and then movement will occur, so that the through hole 71 will gradually become concentric with the liquid flow hole 101 to avoid sudden impact.

[0039] In addition, the spring rod 10 is not a component for the backward movement of the sliding rod 7. When the hydraulic fluid impacts the sliding rod 7, one end of the sliding rod 7 cannot move because it does not coincide with the inner groove 6. However, when they coincide, since the hydraulic fluid will immediately generate a large impact on the sliding rod 7, it is easy to cause damage to the internal structure. Therefore, the spring rod 10 is used to slow down the impact and can also assist in the backward movement of the sliding rod 7.

[0040] Referring to Figures 3 - 8 , a plurality of reinforcing holes 12 are equally spaced in the housing 8 and the locking sleeve 11. The edges of the reinforcing holes 12 are arc-shaped. The number of reinforcing holes 12 is the same as that of the steel balls 92. When the sliding rod 7 is in the initial position, half of the steel balls 92 are located inside the corresponding reinforcing holes 12. The pressure of the pressing rod 91 is applied to the steel balls 92, and then the locking sleeve 11 is fixed by the steel balls 92, so that the correspondingly fixedly connected components are locked, such as the inner rod 5. When the pressing rod 91 moves downward, at this time the steel balls 92 lose their locking function. The hydraulic fluid at the bottom of the inner rod 5 will push it to move, and the locking sleeve 11 moves synchronously with it. The other half of the steel balls 92 are always located inside the housing 8. Therefore, the steel balls 92 will be pressed back when the locking sleeve 11 moves. At this time, the inner rod 5 will no longer be locked. The steel balls 92 can reduce the linkage of the components, so as to be better used in a closed environment. Similar link-like structures can also be used for fixation to ensure sufficient locking.

[0041] Referring to Figures 3 - 8 , the two sides of the bottom end of the pressing rod 91 are arc-shaped, and the top end of the pressing rod 91 is spherical.

[0042] Specifically, when the pressing rod 91 is located inside the semi-circular groove 72, when the sliding rod 7 moves, the two sides of the semi-circular groove 72 are arc-shaped, which will cause the pressing rod 91 to leave the inside of the semi-circular groove 72. The top end of the pressing rod 91 is spherical, which can better squeeze the steel balls 92.

[0043] Embodiment 2, referring to Figures 1 - 10 , is the second embodiment of the present invention, which provides a laterally tilting carriage, including an explosion-proof hydraulic system, and further includes a vehicle frame 1, and a carriage body 2 rotatably connected to the top of the vehicle frame 1. The vehicle frame 1 is rotatably connected to the top of the inner rod 5, and the carriage body 2 is rotatably connected to the cylinder barrel 3.

[0044] The working principle of the present invention is as follows: The carriage body 2 is tilted laterally through the cylinder barrel 3, the first-stage rod 41, the second-stage rod 42, the third-stage rod 43, and the inner rod 5. When the first-stage rod 41, the second-stage rod 42, the third-stage rod 43, and the inner rod 5 expand and contract, their operating modes are the same. Taking the third-stage rod 43 as an example.

[0045] At this time, the sliding rod 7 is in the initial position. Then, the third-level rod 43 is not connected to the inner rod 5. The sleeve 8 is located inside the locking sleeve 11. The return spring 82 between the sleeve 8 and the pressure rod 91 is in a stretched state. At the same time, the pressure rod 91 firmly fixes the inner rod 5 through the steel ball 92 to prevent the hydraulic oil from pushing the inner rod 5 in advance. At this time, the third-level rod 43 moves upward, and the internal components of the third-level rod 43 move synchronously. As the third-level rod 43 gradually moves upward under the action of the hydraulic oil pressure, the sliding rod 7 inside the third-level rod 43 gradually approaches the inner groove 6. When the third-level rod 43 gradually coincides with the inner groove 6, the sliding rod 7 obtains a moving space. The hydraulic oil squeezes the sliding rod 7 from the semi-circular groove 102. Under the action of the hydraulic oil pressure, the sliding rod 7 starts to move. The arc end of the sliding rod 7 away from the spring rod 10 gradually embeds into the inner groove 6. When one end of the sliding rod 7 touches the inner end point 61 of the inner groove 6, the liquid flow hole 101 is concentrically aligned with the through hole 71. At the same time, the positional relationship between the semi-circular groove 72 on the sliding rod 7 and the pressure rod 91 also enables the pressure rod 91 to enter the semi-circular groove 72. The return spring 82 releases part of the tensile force, and the pressure rod 91 releases the locking of the inner rod 5. At this time, the hydraulic oil smoothly flows from the third-level rod 43 through the liquid flow hole 101 and the through hole 71 into the bottom end of the inner rod 5, pushing the inner rod 5 to extend, realizing the orderly telescoping of each level of the rod body.

[0046] When the system retracts, the hydraulic oil flows reversely through the oil return pipeline. First, the inner rod 5 retracts under the action of the hydraulic oil pressure. The locking sleeve 11 at the bottom end of the inner rod 5 is again combined with the sleeve 8. At this time, the sliding rod 7 starts to move back with the assistance of the spring rod 10 and the extrusion of the slope of the inner groove 6 on its arc surface. The through hole 71 gradually separates from the liquid flow hole 101. At the same time, the pressure rod 91 leaves the semi-circular groove 72. Pressed by the top of the sliding rod 7, the pressure rod 91 moves upward to reapply pressure to the steel ball 92, and fixes the locking sleeve 11 through the steel ball 92, so that the inner rod 5 is also fixed.

[0047] Subsequently, the hydraulic oil sequentially retracts the third-level rod 43, the second-level rod 42, and the first-level rod 41 in sequence. During the retraction process, each component resets, and the system returns to the initial state, waiting for the next work instruction.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An explosion-proof hydraulic system, comprising a cylinder barrel (3), characterized in that: It further includes a rod group (4) slidably connected inside the cylinder barrel (3), and an inner rod (5) slidably connected inside the rod group (4); The rod group (4) includes a first-stage rod (41) slidably connected inside the cylinder barrel (3), a second-stage rod (42) slidably connected inside the first-stage rod (41), and a third-stage rod (43) slidably connected inside the second-stage rod (42). The inner structures of the first-stage rod (41), the second-stage rod (42), and the third-stage rod (43) are the same, but the diameters gradually decrease. Inner grooves (6) are provided on the inner walls of the cylinder barrel (3), the first-stage rod (41), and the second-stage rod (42); A slide rod (7) is slidably connected inside the third-stage rod (43). A sleeve (8) is provided inside the third-stage rod (43). A pressing member (9) is slidably connected inside the sleeve (8). A spring rod (10) is connected between the slide rod (7) and the third-stage rod (43). The slide rod (7) includes an initial position and a set position. When the slide rod (7) is in the initial position, the third-stage rod (43) is not communicated with the inner rod (5), and at the same time, the inner rod (5) is fixed by the pressing member (9). When the slide rod (7) is in the set position, the third-stage rod (43) is communicated with the inner rod (5).

2. The explosion-proof hydraulic system according to claim 1, wherein: A liquid flow hole (101) is provided at the center of the circle of the third-stage rod (43). A semi-circular arc groove (102) is provided at the bottom end of the third-stage rod (43). Installation grooves (103) are provided at the bottom ends of both the third-stage rod (43) and the inner rod (5). A chute opening (104) is provided inside the third-stage rod (43). The slide rod (7) is located inside the chute opening (104). A locking sleeve (11) is fixedly connected inside the installation groove (103). An installation groove (103) is provided at the bottom of the inner rod (5).

3. The explosion-proof hydraulic system according to claim 2, characterized in that: Through holes (71) and semi-circular grooves (72) are provided on the slide rod (7). The through holes (71) are the same size as the liquid flow holes (101). One end of the slide rod (7) away from the spring rod (10) is arc-shaped. When the slide rod (7) is in the set position, this end fits with the inner groove (6), and the liquid flow hole (101) is concentric with the through hole (71). The two sides of the semi-circular groove (72) are arc-shaped.

4. The explosion-proof hydraulic system according to claim 2, wherein: The pressing member (9) includes a pressing rod (91) slidably connected inside the sleeve (8), and a plurality of steel balls (92) placed on the top of the pressing rod (91). A limiting ring (81) is provided at the top of the sleeve (8). The limiting ring (81) is located above the steel balls (92) and is in contact with them.

5. The explosion-proof hydraulic system according to claim 4, characterized in that: A return spring (82) is connected between the sleeve (8) and the pressing rod (91). When the slide rod (7) is in the initial position, the sleeve (8) is located inside the locking sleeve (11).

6. The explosion-proof hydraulic system according to claim 3, wherein: When the slide rod (7) is in the initial position, the distance from the center of the liquid flow hole (101) to the center of the through hole (71) is equal to the distance from one end of the slide rod (7) to the inner end point (61) of the inner groove (6), and is also equal to the distance between the center line of the semi-circular groove (72) and the center line of the pressing rod (91).

7. The explosion-proof hydraulic system according to claim 1, wherein: The bottom of the inner groove (6) is a downward-sloping slope, and the top of the inner groove (6) is a horizontal plane.

8. The explosion-proof hydraulic system according to claim 4, characterized in that: A plurality of reinforcing holes (12) are equidistantly formed in the casing (8) and the locking sleeve (11), and the number of the reinforcing holes (12) is the same as that of the steel balls (92). When the sliding rod (7) is in the initial position, half of the steel balls (92) are located inside the corresponding reinforcing holes (12).

9. The explosion-proof hydraulic system according to claim 4, characterized in that: Both sides of the bottom end of the pressing rod (91) are arc-shaped, and the top end of the pressing rod (91) is spherical.

10. A side-tipping carriage, characterized in that: It includes the explosion-proof hydraulic system according to claim 1, and further includes a vehicle frame (1) and a compartment (2) rotatably connected to the top of the vehicle frame (1). The top of the vehicle frame (1) is rotatably connected to the inner rod (5), and the compartment (2) is rotatably connected to the cylinder barrel (3).

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